Ellipticals in GOYA

1
Ellipticals in GOYA

• Status, Plans
• GOYA 4th Science Meeting
• Toulouse, 2005 May 3rd, 4th
• Marc Balcells (IAC)

2
Early-types in GOYA

• Marc Balcells, Nicolás Cardiel, Rafael Guzmán,
  Mercedes Prieto , Roser Pelló, Francisco
  Castander, Enrique García-Dabo, Alfonso
  Aragón-Salamanca, Reynier Peletier
• plus the cluster group at UFL

3
Goals - General

• Field ellipticals
• Extend standard elliptical studies to zgt1
• NIR domain
• Key epoch for formation of ellipticals, setting
  of Hubble types
• Cluster ellipticals
• One-two cluster(s) at z1-1.5
• Similar studies as above
• Promoted by Anthony Gonzalez

4
Science Summary
5
Flamingos2 programs

• Pilot program Comissioning Time 2 masks, 13
  objects
• Full F2 program 94 objects (Groth)
• Planning based on fields

6
Selection zlt1, Groth

• Ims sample, sub-sample with zspec from DEEP
• Spatial distribution of Ims sample on Groth
  strip

25ks field

• Source number on 25ks field 13 galaxies

7
Selection zlt1, Groth

• Magnitude range 18 lt J lt 20
• Concentration-Asymmetry

• Abs line spectroscopy
• S/N20 on continuum

8
Groth zlt1 examples, Im
9
Selection 1ltzlt2, Groth

• Color 4000 break, concentration selection
• Figures observed colors of old SEDs, 0ltzlt3

F814W-J gt 1.5 selects 1ltzlt2
10
Concentration indices

• 94 galaxies fullfill Color and Concentration
  criteria for ellipticals at 1ltzlt2 (10)
• 0.7 ellipticals per sq. arcmin
• Limited by depth of J data.

11
Magnitudes

• Jmag distribution 18.5ltJlt21
• About 1 mag brighter than M
• MK -23.5 -gt Ks20.6 at z2
• Survey K reaches MK at z2
• Color of elíptical at z2 J-Ks2
• J22 en z2 marginal
• Survey K depth is sufficient
• Survey J is marginally insuficient

12
VVDS estimates

• En catalogos espectroscópicos y fotométricos VVDS
• 1.5ltzlt2.5
• HDF-N/S, 5 sq.arcmin
• Ilt24.5 36 objetos
• E/S0 20
• 1.4 elípticas /sq.arcmin
• Klt22 54 objetos
• E/S0 20
• 2 elípticas / sq.arcmin
• 4 veces más pero ellos son K22
• Nosotros en la práctica estamos a K20 (J22
  limit)

13
Open questions

• Contamination by dusty starbursts
• 50
• Dusty starburst should be studied in parallel
  with ellipticals?
• Discriminants
• CAS indices
• 24 micron Spitzer

14
Conclusions

• 15 ellipticals 1ltzlt2 per EMIR field
• 8 ellipticals 1ltzlt2 per F2 field
• Will be more if we can select to J23
• More when including 0.5ltzlt1
• J to J23 S/N5 essential
• 24 micron critical to distinguish starburst-E